From tunnels to towers, artillery sites, resistance nests and communication centers, Nazi Germany left their footprint throughout the world. To this day, silent remains still exist, sentinels guarding clues about plots that Hitler was unable to carry out. The collapse of the Third Reich left as many secrets as it did relics. Still today, remnants of the Nazi's schemes lie concealed in structures scattered across the globe. Skeletons of projects give way to mysteries. Conspiracies abound about s...